Buy more games. The Idle Complete message means your Badges page reports that you do not have any drops remaining for any of your games.

If you visit your Badges page and it says you have drops remaining, try logging out of Idle Master and then back in. If you're not sure where you look on the Badges page, the yellow boxes in this image show where to look.
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=503188239

idle very good for much games-gives me ca 3000 cards in 3 months-but for more as 2K !! games....no games-no cards

ObEyZ^ you can only get the cards if you have games that drop them
you have 3 games

Counter-Strike: Global Offensive

Dragon Nest Europe

Games of Glory

so your not going to get other games cards as you don't own them